Bundle - Wikipedia: "Bundle (mathematics), a generalization of a fiber bundle dropping the condition of a local product structure
Fiber bundle, a topology space that looks locally like a product space
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Sunday, July 30, 2017
Derivation (differential algebra) - Wikipedia
Derivation (differential algebra) - Wikipedia: "The partial derivative with respect to a variable is an R-derivation on the algebra of real-valued differentiable functions on Rn. The Lie derivative with respect to a vector field is an R-derivation on the algebra of differentiable functions on a differentiable manifold; "
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Tangent space - Wikipedia
Tangent space - Wikipedia: "A real-valued function {\displaystyle f:M\to \mathbf {R} } is said to belong to {\displaystyle {C^{\infty }}(M)} if and only if for every coordinate chart {\displaystyle \varphi :U\to \mathbf {R} ^{n}} , the map {\displaystyle f\circ \varphi ^{-1}:\varphi [U]\subseteq \mathbf {R} ^{n}\to \mathbf {R} } is infinitely differentiable. "
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Tangent space - Wikipedia
Tangent space - Wikipedia: "This map turns out to be bijective and may be used to transfer the vector-space operations on {\displaystyle \mathbf {R} ^{n}} over to {\displaystyle T_{x}M} , thus turning the latter set into an {\displaystyle n} -dimensional real vector space."
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Saturday, July 29, 2017
Volume
Volume - Wikipedia: "Integrating the volume form gives the volume of the manifold according to that form."
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Friday, July 28, 2017
Tuesday, July 25, 2017
Multilinear form - Wikipedia
Multilinear form - Wikipedia: "Given a basis {\displaystyle (v_{1},\ldots ,v_{n})} for {\displaystyle V} and its dual {\displaystyle (\phi ^{1},\ldots ,\phi ^{n})} for dual vector space {\displaystyle V^{*}={\mathcal {A}}_{1}(V)} , the wedge products {\displaystyle \phi ^{i_{1}}\wedge \cdots \wedge \phi ^{i_{k}}} , with {\displaystyle 1\leq i_{1}<\cdots
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Sunday, July 23, 2017
Sunday, July 16, 2017
Linear map - Wikipedia
Linear map - Wikipedia: "Since the automorphisms are precisely those endomorphisms which possess inverses under composition, Aut(V) is the group of units in the ring End(V).
If V has finite dimension n, then End(V) is isomorphic to the associative algebra of all n × n matrices with entries in K. The automorphism group of V is isomorphic to the general linear group GL(n, K) of all n × n invertible matrices with entries in K.
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If V has finite dimension n, then End(V) is isomorphic to the associative algebra of all n × n matrices with entries in K. The automorphism group of V is isomorphic to the general linear group GL(n, K) of all n × n invertible matrices with entries in K.
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Linear map - Wikipedia
Linear map - Wikipedia: "If V has finite dimension n, then End(V) is isomorphic to the associative algebra of all n × n matrices with entries in K. The automorphism group of V is isomorphic to the general linear group GL(n, K) of all n × n invertible matrices with entries in K.
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Generalized function - Wikipedia
Generalized function - Wikipedia: "A further way in which the theory has been extended is as generalized sections of a smooth vector bundle. This is on the Schwartz pattern, constructing objects dual to the test objects, smooth sections of a bundle that have compact support. The most developed theory is that of De Rham currents, dual to differential forms. These are homological in nature, in the way that differential forms give rise to De Rham cohomology. They can be used to formulate a very general Stokes' theorem."
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Distribution (mathematics) - Wikipedia
Distribution (mathematics) - Wikipedia: "Distributions are a class of linear functionals that map a set of test functions (conventional and well-behaved functions) into the set of real numbers"
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Distribution (mathematics) - Wikipedia
Distribution (mathematics) - Wikipedia: "Distributions are a class of linear functionals that map a set of test functions (conventional and well-behaved functions) into the set of real numbers"
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Distribution (mathematics) - Wikipedia
Distribution (mathematics) - Wikipedia: "Distributions are a class of linear functionals that map a set of test functions (conventional and well-behaved functions) into the set of real numbers"
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Saturday, July 15, 2017
Singleton (mathematics) - Wikipedia
Singleton (mathematics) - Wikipedia: "In the standard set-theoretic construction of the natural numbers, the number 1 is defined as the singleton { {\displaystyle \varnothing } }."
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Sunday, July 09, 2017
Linear map - Wikipedia
Linear map - Wikipedia: "A linear map from {\displaystyle \mathbf {V} } to {\displaystyle \mathbf {K} } (with {\displaystyle \mathbf {K} } viewed as a vector space over itself) is called a linear functional.[5]
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Continuous symmetry - Wikipedia
Continuous symmetry - Wikipedia: "an intuitive idea corresponding to the concept of viewing some symmetries as motions,"
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Friday, July 07, 2017
Wednesday, July 05, 2017
Algebraic variety - Wikipedia
Algebraic variety - Wikipedia: "The fundamental theorem of algebra establishes a link between algebra and geometry by showing that a monic polynomial (an algebraic object) in one variable with complex number coefficients is determined by the set of its roots (a geometric object) in the complex plane. Generalizing this result, Hilbert's Nullstellensatz provides a fundamental correspondence between ideals of polynomial rings and algebraic sets. Using the Nullstellensatz and related results, mathematicians have established a strong correspondence between questions on algebraic sets and questions of ring theory. This correspondence is the specificity of algebraic geometry.
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Sunday, July 02, 2017
Homogeneous polynomial - Wikipedia
Homogeneous polynomial - Wikipedia: "A polynomial of degree 0 is always homogeneous; it is simply an element of the field or ring of the coefficients,"
n-forms share being homogeneous with their field.
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n-forms share being homogeneous with their field.
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Saturday, July 01, 2017
Metric tensor (general relativity) - Wikipedia
Metric tensor (general relativity) - Wikipedia: "The flat space metric (or Minkowski metric) is often denoted by the symbol η and is the metric used in special relativity."
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